Complete Boat Winterization Checklist for Any Climate

Proper winterization protects your boat from damage during storage. Even in South Florida, seasonal storage requires preparation.

Engine Winterization

Outboards

1. Run to operating temperature
2. Change oil and filter while warm
3. Add fuel stabilizer, run 10 minutes
4. Flush cooling system
5. Fog engine with fogging oil
6. Disconnect and store battery charged

Inboards/Stern Drives

1. Change engine oil and filter
2. Change transmission fluid
3. Drain and flush cooling system
4. Fog cylinders
5. Close seacocks

See engine type differences.

Fuel System

• Fill tank to 90-95% (prevents condensation)
• Add fuel stabilizer
• Run engine to circulate treated fuel

Freshwater Systems

• Drain freshwater tank and water heater
• Pump non-toxic antifreeze through lines
• Empty holding tanks

Exterior

• Wash and wax (wax guide)
• Clean and treat canvas and vinyl
• Cover with breathable cover
• Remove drain plugs

Interior

• Remove all food and perishables
• Clean all surfaces
• Open compartments for air circulation
• Place moisture absorbers

Electrical

• Turn off all switches
• Remove batteries or use maintenance charger (battery guide)
• Clean terminals

For storage options, see Indoor vs. Outdoor Storage.

Find storage facilities through Boatwork.